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From: Alf Peake
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 12:14:05
Message: <3be3df8d@news.povray.org>
Brilliant! Looks very realistic in its movements.

I made a spider around 3-4 years ago with the intention of animating
it. Hadn't heard of IK then. I gave up when the headaches started.
Could not avoid foot slippage on all legs. Had realised that, in
general, the larger the spider in real-life - the smoother the body
moved. Also had trouble trying to turn the beast - legs kept fouling
each other.

Alf


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From: Rune
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 12:49:14
Message: <3be3e7ca@news.povray.org>
"Tony[B]" wrote:
> Very nice!

Thanks! :)

> The only thing I would comment is that it looks a bit
> "hoppy", like the body bobs up and down

I noticed that too but only in the final render and I didn't want to
rerender then.

> I'm very impressed with all these things you manage
> to get POV to do. I wish I knew more about math and such...

I don't use advanced math, only things like solving linear equations and
such (ok, also a bit trigonometry occasionally). The tricky part is to have
the creativity to come up with the right techniques I guess.

One of the things I've learned that I've had the most use of in many
different projects is to take a lot of samples, store them in arrays, and
then interpolate linearly between them. It's extremely powerful. A typical
use is to move a point with constant speed along a spline even though the
spline doesn't have constant speed.

But anyway, so far all my animations have been merely tests. I admire those
who come beyond that...

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:    http://rsj.mobilixnet.dk (updated June 26)
POV-Ray Users:   http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk


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From: Rune
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 12:49:15
Message: <3be3e7cb$1@news.povray.org>
"Slime" wrote:
> That's very very realistic. It actually gave me that
> creepy feeling I get when I look at big spiders and
> stuff like that.

Excellent! That's what I was hoping. ;)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:    http://rsj.mobilixnet.dk (updated June 26)
POV-Ray Users:   http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk


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From: Rune
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 12:49:16
Message: <3be3e7cc$1@news.povray.org>
"Nekar Xenos" wrote:
> Wow!

Thanks! :)

BTW, you don't need to quote my entire message just to say that...

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:    http://rsj.mobilixnet.dk (updated June 26)
POV-Ray Users:   http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk


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From: Rune
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 12:49:18
Message: <3be3e7ce@news.povray.org>
"ingo" wrote:
> This look very good Rune.

Thanks!

> There is something a bit unnatural in it, can't put my
> finger on it though. Maybe it's the unsmooth body movement
> Tony mentioned.

I think so...

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:    http://rsj.mobilixnet.dk (updated June 26)
POV-Ray Users:   http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk


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From: Rune
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 12:56:05
Message: <3be3e965@news.povray.org>
"Warp" wrote:
>   I think that spiders do not hop their bodies up and
> down when they walk, but the body advance smoothly like
> a spaceship while the legs do their work.

Yes, I agree.

Actually the hopping was not intentional, but caused by the fact that the
body position is based on an average of all the feet positions. I'll try to
change that.

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:    http://rsj.mobilixnet.dk (updated June 26)
POV-Ray Users:   http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk


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From: Rune
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 12:56:07
Message: <3be3e967@news.povray.org>
"Alf Peake" wrote:
> Brilliant! Looks very realistic in its movements.

Thanks! :)

> I made a spider around 3-4 years ago with the
> intention of animating it.

Maybe you could send me the model and if I like it I could use it for the
animation? :)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:    http://rsj.mobilixnet.dk (updated June 26)
POV-Ray Users:   http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Webring: http://webring.povray.co.uk


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From: Rick [Kitty5]
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 13:17:38
Message: <3be3ee72$1@news.povray.org>
Very impressive - now if you could convert your pending IK inc (grin) to a
bones system - deforming meshes and all that :))


--
Rick

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POV-Ray News & Resources - http://Povray.co.uk
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From: Mahalis
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 15:10:11
Message: <3be408d3@news.povray.org>
Or maybe it's the fact that spiders don't tend to walk in a circle like that
unless the're drunk.. :-)

--

//Mahalis
camera{location<0,0.25,-2> look_at 0.5*y} #declare T=texture{pigment{crackle
scale 0.5 rotate 90 turbulence 0.75 color_map{[0 rgb 1][0.05 rgb 1][0.1
rgb<1,0.25,1>][0.25 rgbf 1][1 rgbf 1]}} finish{ambient 1}} #declare
c=difference{torus{0.5,0.1 rotate -90*x}box{<0.7,0,0.2>,<-0.7,-0.7,-0.2>}}
merge{object{c translate<0.5,0.5,0>} object{c translate<-0.5,0.5,0>}
cylinder{<1,0.5,0>,<1,0,0>,0.1} cylinder{<-1,0.5,0>,<-1,0,0>,0.1}
cylinder{0.5*y,0,0.1} texture{T}}
--


"Rune" <run### [at] mobilixnetdk> wrote in message
news:3be3e7ce@news.povray.org...
> "ingo" wrote:
> > This look very good Rune.
>
> Thanks!
>
> > There is something a bit unnatural in it, can't put my
> > finger on it though. Maybe it's the unsmooth body movement
> > Tony mentioned.
>
> I think so...
>
> Rune
> --
> 3D images and anims, include files, tutorials and more:
> Rune's World:    http://rsj.mobilixnet.dk (updated June 26)
> POV-Ray Users:   http://rsj.mobilixnet.dk/povrayusers/
> POV-Ray Webring: http://webring.povray.co.uk
>
>


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From: Alf Peake
Subject: Re: Spider Crawling Along Path
Date: 3 Nov 2001 15:58:27
Message: <3be41423@news.povray.org>
"Rune" <run### [at] mobilixnetdk> wrote in message
news:3be3e967@news.povray.org...
[snip]
> Maybe you could send me the model and if I like it I could use it
for the
> animation? :)


I don't have a decent source handy right now, its very modified and
messy. A mix of Pov 2.1, 3 and 3.1. I uploaded a clean source to
Compuserve around 97/98 so should have that archived around here
somewhere. I'll let you know if I find it.

These are some pics, the first may be a dead link now.
http://ourworld.compuserve.com/homepages/Alf_Peake/SPIDER.JPG
http://www.peake42.freeserve.co.uk/pix1/web2.jpg

Each leg has 4 segments, and each knee is a section of a torus divided
with a short cylinder inserted. Each knee was in a single plane and
could cover around 160 deg. An infinite number of solutions for each
shoulder / foot location :( I used "90 deg phase" between legs on one
side and 180 deg difference between sides.

Alf


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